Showing selected values in a HABTM

Hey everyone, I did try looking around here and on google for this
issue, however I can only find data that relates to problems 3 years
ago, which doesn't help as much as I'd like it to. I could likely use
it, but I figured that by now, Cake must have a more elegant way of
doing this.

I want to show the data that was selected in a HABTM in my edit form.
I can see that the data is populated in $this->data when I do a
read(), however it doesn't seem to be populating the multi-select box
I have created.

This is the code for the multi-select box:
echo $form->input('Activity', array('label' => false, 'type' =>
'select', 'options' => $dbactivities, 'multiple' => true));

Can anyone tell me how to display what items are selected?

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